CN110958014A - Low-phase-noise anti-vibration crystal oscillator - Google Patents
Low-phase-noise anti-vibration crystal oscillator Download PDFInfo
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Abstract
The invention discloses a low-phase noise vibration-proof crystal oscillator, which adopts a closed-loop feedback compensation framework based on an analog circuit, wherein a power divider divides an output signal of a voltage-controlled crystal oscillator into two paths, one path of the output signal is input into a phase-voltage conversion circuit, the output signal is converted into a corresponding voltage signal according to the phase of the output signal of the voltage-controlled crystal oscillator, the corresponding voltage signal is subjected to voltage comparison and circuit-to-reference voltage subtraction to generate a compensation voltage difference signal, and the compensation voltage difference signal is subjected to addition circuit and voltage-controlled voltage V0Adding to obtain compensated voltage-controlled voltage
Voltage controlled voltage V of filter paircAnd after filtering, loading the filtered signal to a voltage-controlled end of the voltage-controlled crystal oscillator for compensation, and realizing the compensation of the phase of the output signal. Compared with the existing active compensation vibration-proof crystal oscillator, the method can directly convert the phase position related to the vibration in real time into the compensation voltage in one-to-one mapping relation with the phase position to carry out compensation, and can overcome the defect that the existing active compensation vibration-proof crystal oscillatorThe hysteresis problem caused by the use of an acceleration sensor in the vibration type crystal oscillator.
Description
Technical Field
The invention belongs to the technical field of crystal oscillators, and particularly relates to a low-phase-noise anti-vibration crystal oscillator.
Background
An Anti-vibration crystal Oscillator (AVXO) is a crystal Oscillator that can operate in a specific vibration environment and maintain the output phase of the crystal Oscillator within a certain accuracy range in a certain manner. The method has the characteristics of low phase noise, high stability and the like, and is widely applied to various communications, navigation, radars, satellite positioning systems, mobile communications and various electronic measuring instruments.
An anti-vibration crystal Oscillator is essentially a Voltage Controlled crystal Oscillator (VCXO) with a vibration compensation network and generating a vibration dependent compensation Voltage therefrom. Since the crystal oscillator is a device extremely sensitive to vibration, the phase noise index of the crystal oscillator is usually seriously deteriorated under a dynamic condition, thereby seriously affecting the key performance of the whole system. The single sideband phase noise of the crystal oscillator caused by random vibration acceleration is expressed as follows:
in the formula, ApIs the maximum amplitude of vibration, A is the real-time amplitude of vibration, QLBeing oscillator circuitsThe quality factor of the load is determined,
is the phase change of the crystal oscillator due to acceleration, f0Is the center frequency, fvIs the vibration frequency.
The linear phase gain characteristic for a commonly used voltage controlled oscillator can be approximated as follows:
wherein the content of the first and second substances,
is the voltage control-phase sensitivity, V, of a voltage controlled crystal oscillatorCIs the control voltage of the voltage controlled crystal oscillator,
is the voltage-controlled center voltage of the voltage-controlled terminal of the voltage-controlled crystal oscillator,
is input with a voltage-controlled center voltage of
The phase of time.
In order to realize equation (2), a compensation voltage needs to be generated and applied to the voltage-controlled crystal oscillator to compensate so as to counteract the phase drift generated by the vibration, so that the output phase of the oscillator is stable under the vibration, and the purpose of compensation is achieved.
At present, an active compensation method for implementing an anti-vibration crystal oscillator is an anti-vibration crystal oscillator based on an active compensation network of an acceleration sensor. Fig. 1 is a schematic block diagram of an anti-vibration crystal oscillator based on an active compensation network of an acceleration sensor. As shown in FIG. 1, the anti-vibration crystal oscillator is an open loop compensation method, which is characterized in that in an acceleration sensor and conditioning circuit 101, the acceleration sensor is used for measuring the real-time vibration acceleration of the crystal oscillator subjected to vibration, and then the real-time vibration acceleration is passed throughThe conditioning circuit obtains acceleration
The microprocessor 102 is based on acceleration
Calculating the compensation voltage value, and generating a compensation voltage by the compensation network
And applying the compensation voltage
Is applied to the voltage controlled crystal oscillator 104 to cancel the phase change of the crystal oscillator caused by vibration, i.e., phase noise.
Obviously, the existing anti-vibration crystal oscillator based on the active compensation network of the acceleration sensor adopts an open-loop compensation framework, and the acceleration sensor is used, the acceleration sensor is close to the crystal resonator as far as possible on the circuit, and the resonator of the crystal resonator is separately packaged in a closed space, so that hysteresis is inevitably generated, and the compensation precision of the anti-vibration crystal oscillator is obviously influenced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a low-phase-noise anti-vibration crystal oscillator so as to avoid the error problem caused by the inconsistency between the acceleration sensed by a sensor and the real-time acceleration of a resonator and reduce the phase noise.
In order to achieve the above object, the low phase noise vibration-resistant type crystal oscillator according to the present invention comprises:
a voltage controlled crystal oscillator for generating a desired signal (output signal);
it is characterized by also comprising:
the power divider is used for dividing an output signal of a voltage controlled crystal oscillator (VCXO) into two paths, wherein one path is used as an output signal of the low-phase noise anti-vibration crystal oscillator, and the other path is output to the phase-voltage conversion circuit;
a phase-to-voltage conversion circuit for converting the phase of the output signal of the voltage-controlled crystal oscillator into a voltage signal under dynamic conditions
And output to the voltage comparison circuit;
a voltage comparison circuit for comparing the voltage signal
Voltage converted from phase of output signal of voltage controlled crystal oscillator under static condition
Making difference to obtain compensation voltage signal
And output to the adder circuit;
wherein
The voltage-controlled crystal oscillator adjusts the voltage-controlled voltage to be
When the voltage-controlled crystal oscillator is used, the voltage signal obtained by phase conversion of the input signal of the voltage-controlled crystal oscillator is input to the phase-to-voltage conversion circuit, and the voltage signal is used as the reference voltage of the voltage comparison circuit;
an adding circuit for adding the compensation voltage signal
Voltage controlled voltage V of voltage controlled crystal oscillator0Adding to obtain compensated voltage-controlled voltage
Filter for voltage-controlled voltage VcFiltering, loading to voltage-controlled crystal oscillator, and outputting signalAnd (4) compensating the signal phase.
The purpose of the invention is realized as follows:
the invention relates to a low-phase noise anti-vibration crystal oscillator, which adopts a closed-loop feedback compensation framework based on an analog circuit, wherein a power divider divides an output signal of a voltage-controlled crystal oscillator into two paths, one path of the output signal is input into a phase-voltage conversion circuit, a phase-voltage conversion module is an analog circuit, the output signal is converted into a corresponding voltage signal according to the phase of the output signal of the voltage-controlled crystal oscillator, the voltage signal is subjected to voltage comparison to make a difference with a reference voltage to generate a compensation voltage difference signal, and the compensation voltage difference signal is subjected to addition of an addition circuit and a voltage-controlled0Adding to obtain compensated voltage-controlled voltage
Voltage controlled voltage V of filter paircAnd after filtering, loading the filtered signal to a voltage-controlled end of the voltage-controlled crystal oscillator for compensation, and realizing the compensation of the phase of the output signal.
Compared with the existing active compensation anti-vibration crystal oscillator, the low-phase-noise anti-vibration crystal oscillator has the following technical advantages:
1) the invention does not need an acceleration sensor, but directly converts the phase position related to the vibration in real time into the compensation voltage in one-to-one mapping relation with the phase position for compensation, and the method can overcome the hysteresis problem caused by using the acceleration sensor in the existing anti-vibration crystal oscillator;
2) the invention adopts a closed-loop compensation framework, establishes the relation between the input signal and the compensation voltage through phase-voltage conversion, and is easier to realize real-time high-precision compensation;
3) the invention has simple compensation process, converts the phase of the output signal of the voltage-controlled crystal oscillator into voltage, and obtains the compensation voltage by comparing the voltage with the reference voltage. The invention has simpler structure, and is easy to integrate and produce in batch;
4) the invention can be well suitable for voltage-controlled crystal oscillators with various frequencies, and is particularly more obvious for high-frequency crystal oscillators with poor compensation effect in the prior art.
Drawings
FIG. 1 is a schematic block diagram of a prior art active compensated anti-vibration crystal oscillator;
FIG. 2 is a schematic block diagram of an embodiment of a low phase noise anti-vibration crystal oscillator according to the present invention;
FIG. 3 is a circuit schematic of one embodiment of the phase-to-voltage conversion circuit shown in FIG. 2;
fig. 4 is a circuit schematic of one embodiment of the summing circuit shown in fig. 2.
Detailed Description
The following description of the embodiments of the present invention is provided in order to better understand the present invention for those skilled in the art with reference to the accompanying drawings. It is to be expressly noted that in the following description, a detailed description of known functions and designs will be omitted when it may obscure the subject matter of the present invention.
Fig. 2 is a schematic block diagram of an embodiment of a low phase noise anti-vibration crystal oscillator according to the present invention.
In the present embodiment, as shown in fig. 2, the low phase noise vibration-resistant crystal oscillator of the present invention includes a voltage controlled crystal oscillator 1, a power divider 2, a phase-voltage conversion circuit 3, a voltage comparison circuit 4, an adder circuit 5 and a filter 6.
The voltage controlled crystal oscillator 1 generates a required signal, namely an output signal, the power divider 2 divides the output signal of the voltage controlled crystal oscillator 1(VCXO) into two paths, one path is used as the output signal of the low phase noise anti-vibration crystal oscillator, and the other path is output to the phase-voltage conversion circuit 3.
The phase-voltage conversion circuit 3 converts the phase of the output signal of the voltage-controlled crystal oscillator 1 into a voltage signal under a dynamic condition
And outputs the voltage to the voltage comparison circuit 4, wherein,
the acceleration is represented by the acceleration of the vehicle,
indicating the phase.
The voltage comparison circuit 4 compares the voltage signal
Voltage converted from phase of output signal of voltage controlled crystal oscillator 1 under static condition
Making difference to obtain compensation voltage signal
And output to the adder circuit. Wherein the content of the first and second substances,
the voltage-controlled crystal oscillator 1 adjusts the voltage-controlled voltage to be
In the meantime, the voltage-controlled crystal oscillator inputs a voltage signal obtained by phase conversion of a signal to the phase-voltage conversion circuit, and the signal is used as a reference voltage of the voltage comparison circuit 4.
The adding circuit 5 compensates the voltage signal
Voltage-controlled voltage V of voltage-controlled crystal oscillator 10Adding to obtain compensated voltage-controlled voltage
Filter 6 pair voltage-controlled voltage VcFiltering is carried out, and then the voltage controlled crystal oscillator 1 is loaded to realize the compensation of the phase of the output signal.
When the anti-vibration crystal oscillator is used specifically, the anti-vibration crystal oscillator is under the vibration condition, and the voltage-controlled oscillator VCXO is under the voltage-controlled voltage V0Under the influence of vibration acceleration, the output phase is
The signal is divided into two paths by the power divider, one path is used as the output of the anti-vibration crystal oscillator, and the other path is output to the phase-voltage conversion circuit.
A phase-voltage conversion circuit for converting the phase of the input signal into a voltage
The signal is output to the voltage comparison circuit.
Fig. 3 is a circuit schematic diagram of an embodiment of the phase-to-voltage conversion circuit shown in fig. 2.
In this embodiment, as shown in FIG. 3, the voltage comparison circuit compares the voltage signal with the reference voltage
And a reference voltage
Making a difference to obtain
I.e. the compensation voltage signal, and output to the adder circuit.
Fig. 4 is a circuit schematic of one embodiment of the summing circuit shown in fig. 2.
In this embodiment, as shown in FIG. 4, the voltage signal is compensated
Voltage controlled voltage V of voltage controlled crystal oscillator0Adding to obtain compensated voltage-controlled voltage
Voltage-controlled voltage V by filtercAfter filtering, loading the filtered signal to a voltage-controlled crystal oscillator to realize output-to-outputAnd (4) compensating the phase of the output signal.
Although illustrative embodiments of the present invention have been described above to facilitate the understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, and various changes may be made apparent to those skilled in the art as long as they are within the spirit and scope of the present invention as defined and defined by the appended claims, and all matters of the invention which utilize the inventive concepts are protected.
Claims (1)
1. A low phase noise, vibration resistant crystal oscillator comprising:
a voltage controlled crystal oscillator for generating a desired signal (output signal);
it is characterized by also comprising:
the power divider is used for dividing an output signal of a voltage controlled crystal oscillator (VCXO) into two paths, wherein one path is used as an output signal of the low-phase noise anti-vibration crystal oscillator, and the other path is output to the phase-voltage conversion circuit;
a phase-to-voltage conversion circuit for converting the phase of the output signal of the voltage-controlled crystal oscillator into a voltage signal under dynamic conditions
And output to the voltage comparison circuit;
a voltage comparison circuit for comparing the voltage signal
Voltage converted from phase of output signal of voltage controlled crystal oscillator under static condition
Making difference to obtain compensation voltage signal
And output to the adder circuit;
wherein
The voltage-controlled crystal oscillator adjusts the voltage-controlled voltage to be
When the voltage-controlled crystal oscillator is used, the voltage signal obtained by phase conversion of the input signal of the voltage-controlled crystal oscillator is input to the phase-to-voltage conversion circuit, and the voltage signal is used as the reference voltage of the voltage comparison circuit;
an adding circuit for adding the compensation voltage signal
Voltage controlled voltage V of voltage controlled crystal oscillator0Adding to obtain compensated voltage-controlled voltage
Filter for voltage-controlled voltage VcFiltering, and loading to a voltage-controlled crystal oscillator to realize the compensation of the phase of the output signal.
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| CN102075141A (en) * | 2010-12-28 | 2011-05-25 | 单庆晓 | Oven controlled crystal oscillator (OCXO) with acceleration compensation |
| CN102751948A (en) * | 2012-08-06 | 2012-10-24 | 上海无线电设备研究所 | Anti-vibration installation method for crystal oscillator and crystal oscillator component |
| CN103634002A (en) * | 2013-12-23 | 2014-03-12 | 北京无线电计量测试研究所 | Real-time calibration system and method for broadband VCO (Voltage Controlled Oscillator) linearity |
| CN107276582A (en) * | 2017-05-17 | 2017-10-20 | 电子科技大学 | A kind of temperature compensating crystal oscillator based on analog circuit |
| CN207184453U (en) * | 2017-07-18 | 2018-04-03 | 成都世源频控技术股份有限公司 | A kind of miniaturization vibration proof structure of crystal oscillator |
| CN109889192A (en) * | 2019-03-25 | 2019-06-14 | 中国电子科技集团公司第二十六研究所 | A kind of crystal oscillator antivibration method, apparatus and hybrid compensation anti-shake system |
-
2019
- 2019-11-29 CN CN201911199686.0A patent/CN110958014B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102075141A (en) * | 2010-12-28 | 2011-05-25 | 单庆晓 | Oven controlled crystal oscillator (OCXO) with acceleration compensation |
| CN102751948A (en) * | 2012-08-06 | 2012-10-24 | 上海无线电设备研究所 | Anti-vibration installation method for crystal oscillator and crystal oscillator component |
| CN103634002A (en) * | 2013-12-23 | 2014-03-12 | 北京无线电计量测试研究所 | Real-time calibration system and method for broadband VCO (Voltage Controlled Oscillator) linearity |
| CN107276582A (en) * | 2017-05-17 | 2017-10-20 | 电子科技大学 | A kind of temperature compensating crystal oscillator based on analog circuit |
| CN207184453U (en) * | 2017-07-18 | 2018-04-03 | 成都世源频控技术股份有限公司 | A kind of miniaturization vibration proof structure of crystal oscillator |
| CN109889192A (en) * | 2019-03-25 | 2019-06-14 | 中国电子科技集团公司第二十六研究所 | A kind of crystal oscillator antivibration method, apparatus and hybrid compensation anti-shake system |
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